A New Hybrid Cmpo/Nopopo Ligand: Synthesis and Selected Lanthanide Coordination Chemistry

Abstract

A two-step synthesis for 2,6-bis[(diphenyl)-N,N-diethylcarbamoylmethylphosphine oxide]pyridine N-oxide (3) from 2,6-bis[(diphenylphosphinoyl)methyl]pyridine is reported along with coordination chemistry with Dy(III) and Yb(III). Crystal structure determinations for the ligand 3_S,S and 1:1 complexes [Dy(3_R,S )(NO₃)₃]·(Me₂CO) and [Yb(3_R,S )(NO₃)₃]·(Me₂CO) are described. In these complexes, the pentafunctional ligand 3 coordinates in a tridentate NOPOPO chelate mode.

GRAPHICAL ABSTRACT

Keywords:

• Carbamoylmethylphosphine oxide
• 2,6-bis[(phosphinoyl)methyl]pyridine N- oxide
• lanthanide coordination chemistry

Acknowledgments

Financial support for this study at the University of New Mexico was provided by the Division of Chemical Sciences, Geosciences and Biosciences, Office of Basic Energy Sciences, and U.S. Department of Energy (Grant DE-FG02-03ER15419 (R.T.P). In addition, funds from the National Science Foundation assisted with the purchases of the X-ray diffractometer (CHE-0443580) and NMR spectrometers (CHE-0840523 and -0946690).